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WorksheetsLAB M2 Ex. 4: Qual. Analysis of Amino Acids and Proteinsi
Total questions: 12
Worksheet time: 7mins
(a) are the building blocks of proteins, linked with one another through a peptide bond (an amide bond) to form the primary structure of a protein.
All the 20 common amino acids are α-amino acids (except for ________).
Glycine
Proline
All amino acids, except ________ exhibit chirality which makes them optically active substances
Glycine
Proline
a dipolar ion in a solution
zwitterions
ninhydrin
The following amino acids (lesser extent) absorb light in the ultraviolet-visible region of the spectra.
tryptophan
tyrosine
phenylalanine
glycine
Biuret Test Result
Positive - Purple
Negative - Purple
Positive - Blue
Negative - Blue
Ninhydrin Test Result
Positive - Purple
Positive - No change in color
Negative - No change in color
Positive - No change in color
Xanthoproteic Positive Test Result
Yellow
Blue
Millons Postive Test Result
Red
Purple
Sakaguchi Positive Test Result
Red
Blue
Appearance of a violet ring in between the solution.
Hopkins Cole Test
Lead Acetate Test
Appearance of black precipitate in a solution.
Hopkins Cole Test
Lead Acetate Test
